Harrow.



No. 864,288. PATENTED AUG. 2.7, 1907. P. P. BowMAN.

HARROW.

APPLICATION FILED JULY 3., 1908,

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lATENTBD AUG; 2v, 1907.

P. P. vBOWMIAN. HARRW. .LPPLIUATIOI IILED JULIE. 1905.

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. UNITED STATES PATENT OFFICE.

HARROW.

` Specification of Letters Patent.

Patented Aug. 27, 19o?.

Application filed July 3, 1906. Serial No. 824,636.

To all whom it may concern.'

Be it known that I, FRANK I. BowMAN, residing at Bridgewater, in thecounty of Rockingham and State of Virginia, have invented certain newand useful Improvements in Harrows, of which the following is aspecification.

My invention relates to certain new and useful improvements in harrowsand it more particularly seeks to provide a harrow of a very simple andeffective construction in which means are provided for relieving thestrain on the harrow teeth when they engage obstructions such as rocks,stumps etc., and in which means are also provided whereby the harrowteeth may be adjusted to any desired angle so that the harrow may beused as a harrow proper, a digger, or a Crusher, as may be founddesirable.

My invention also embodies an improved device for securing the harrowteeth in the tooth bar.

Generally, my invention comprises a harrow frame in which a plurality oftooth bars are pivoted, a rod pivotally connected with each tooth bar,an operating lever connected to the rod, by means of which the tooth'barmay be locked to hold the teeth at the desired angle, and means withinthe rod and cooperating with the tooth bars for relieving such toothbars to permit them to independently turn on their pivots when the teeththereof engage an obstruction, so that the teeth will pass over theobstruction without moving the other tooth bars.

With other objects in view than have been heretofore specified, myinvention also comprises certain novel construction, and arrangement ofparts, all of which will be Iirst described in detail and thenspecifically pointed out in the appended claims, reference being had tothe accompanying drawings, in which:-

Figure l, is a perspective view of my harrow. Fig. 2, is a vertical,longitudinal section thereof, showing the teeth in a vertical position,one set clearing an obstruction. Fig. 3, is a similar view, the teethbeing shown in a position to convert the harrow into a digger in fulllines, and in a position to act as a Crusher in dotted lines. Fig. 4, isa detail perspective view of one of the tooth bars. Fig. 5, is a detailcross section on the line 5 5 of Fig. 2. Fig. 6, is a detail perspectiveview of the tooth bar connecting rod. lqig. 7, is a similar view of theoperating lever. Fig. 8, is a detail perspective view of a tooth and itssecuring collar detached.

Referring now to the accompanying drawings, in which like numerals andletters of reference indicate like parts in all of the figures, ldesignates the side bars of the draft frame, which at each end arebraced by transverse bars 2 2. The side bars l terminate at the front indraft hooks la, as shown.

The bars l1 at suitable intervals have bearing apertures Il in which thebearing studs 3' of the tooth bars 3 are fulcrumed. The tooth bars 3comprise a member substantially U-shaped in cross section provided atsuitable intervals with tooth receiving apertures 3c in the flats of thebar in which the teeth 4 lit, and to hold the teeth 4 in place, I formthem angular in cross section, and the apertures 3" to correspond.Between the flats of the U-shaped bars 3 are split collars 5, throughwhich the teeth 4 pass, which teeth being formed slightly wedge shapedare hammered down tightly into the collar 5, thus securing them firmlyin place.

Each tooth bar 3 has a clamp 6 that is secured thereto by a bolt and nut6a or rivets, if desired, which clamps 6 are each provided with upwardlyprojecting arms 6l terminating in an upwardly extending finger or lug 6cto fit within the tubular connecting rod 7. The rod 7 has a slot 7 *Lextending its full length on the under-face thereof to permit passage ofthe ends of the arms 6b, as shown. At the rear end, the rod 7 isprovided with a segmental rack 9, one end 9L of which is secured to thebar 7 by rivets 91" or otherwise, while the other endl 9C passes intothe rod 7 and is apertured to permit passage of a bolt l0 that passesthrough the end of the rod 7 and through an operating lever l1 whoselower end terminates in a curved portion l1a and a bearing linger 1Ibthat enters a bearing aperture 3e in the rear tooth bar 3, suchconnection with the bar 3 being loose to enable proper manipulationofthe lever 1l on its pivot bolt 10. The lever ll carries a latch l2that is adapted to enter the rack notches of the segmental rack 9, andis also provided with a hand engaging latch operatinglever 13 thatconnects with the latch 12 by a rod 14, as clearly shown in thedrawings. The rod 7 it will be observed, forms a housing for the buffersprings 8 and the ends of the arms that coperate therewith, and therebyfully protects such parts from the elements as well as from danger ofinjury. The stops 7b serve as abutments for the buffer springs 8 as wellas stops for the tooth bar operating arms.

When the apparatus is operated as a harrow, and the parts are in theposition shown in Figs. l and 2, the buffer springs 8 will be at theirnormal tension, which tension will become increased when the parts arein the position shown in dotted lines in Fig. 3, the crushing position.The tension of the springs 8 may be also increased i desired, bythrowing the lever Il backward to bring the teeth toward the positionshown in full lines in Fig. 3. l

From the foregoing it will be seen that I have provided a very simpleand effective construction of harrow in which ythe various adjustmentsof the teeth can be readily made and which embodies all the essentialadvantages of a rigid or spike tooth harrow as well as those of the socalled spring tooth type. Also the means for securing the tooth barenables a tooth to be readily replaced when broken or worn withoutdismembering the apparatus or without necessitating the removal of theremaining teeth in the bar. Again, by having the tooth bars adjustable,a greater range of Work is possible With this barrow than With rigidtooth harrows now in common use.

By mounting the tooth bars as described, only that bar Whose tooth ispassing over an obstruction is inactive during such period, since assoon as the indi vidual bar passes over the obstruction it springs backrto its normal position and is again at Work ere the next following barsteeth meet the obstruction.

From the foregoing description taken in connection with the accompanyingdrawings it is thoughtl the complete construction, operation andnumerous ad vantages ofmy invention willl be readily understoody bythose skilled inthe art to which it appertains, and I desire to say thatslight changes in the detail construction` and arrangement oi parts maybe made without departing` from the scope'of my invention or thaty ofthe appended claims.

What I claim is:-vr

1 A hai-row comprising in combination, a draft frame,v

2 seines' said rod having stops, coil springs within saidV rod betweensaid fingers and stops, and means for adjusting said rod and holding itin its adjusted positions, substantially as shown and described.

3. A harroW comprising a draft frame, a series of tooth bars pivotallymounted thereon, clamps having arms secured to each bar, a slottedtubular rod held over the ends of said arms, said arms having fingerswithin said rod, said rod having stops, coil springs within said rodbetween said fingers and stops, a segmental rack secured to said rod atone end, a lever pivoted to said rod and having,r a

4. In a harrow, pivoted tooth bars, means for adjusting said bars tovarious positions, buffer devices for each bar,

,and means forming a housing for said buffer devices, substantially asshown and described.

5. ln a harrow, a draft frame, a plurality of tooth bars fulcrumedtherein, a rod. pivotally connected with each vltooth bar, an operatinglever connected to the rod, means lwithin the rod and coperating withthe tooth bars for relieving said tooth bars to permit themV toindependently :turn on their pivots when the teeth thereof engage anobstruction.

G. A harrow comprising in combination, a draft frame, a plurality oftooth bars fulcrumed therein, arms carried by the tooth bars, a hollowrod connecting the ends of said arms, briller springs mounted withinsaid hollow rod and operatively engaging the tooth bar arms, stopscarried by the rod to coperate with the arms, and means for adjustingsaid rod to set the teeth at various angles to the work.

FRANK P. BOWMAN. Witnesses A. E. DIETERICH, JOHN T. SCHROTT.

